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// --------------------------------------------------------------------------
//
// File
// Name: LocalProcessStream.cpp
// Purpose: Opens a process, and presents stdin/stdout as a stream.
// Created: 12/3/04
//
// --------------------------------------------------------------------------
#include "Box.h"
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "LocalProcessStream.h"
#include "autogen_ServerException.h"
#include "Utils.h"
#ifdef WIN32
#include "FileStream.h"
#else
#include "SocketStream.h"
#endif
#include "MemLeakFindOn.h"
#define MAX_ARGUMENTS 64
// --------------------------------------------------------------------------
//
// Function
// Name: LocalProcessStream(const char *, pid_t &)
// Purpose: Run a new process, and return a stream giving access
// to its stdin and stdout (stdout and stderr on
// Win32). Returns the PID of the new process -- this
// must be waited on at some point to avoid zombies
// (except on Win32).
// Created: 12/3/04
//
// --------------------------------------------------------------------------
std::auto_ptr<IOStream> LocalProcessStream(const std::string& rCommandLine,
pid_t &rPidOut)
{
#ifndef WIN32
// Split up command
std::vector<std::string> command;
SplitString(rCommandLine, ' ', command);
// Build arguments
char *args[MAX_ARGUMENTS + 4];
{
int a = 0;
std::vector<std::string>::const_iterator i(command.begin());
while(a < MAX_ARGUMENTS && i != command.end())
{
args[a++] = (char*)(*(i++)).c_str();
}
args[a] = NULL;
}
// Create a socket pair to communicate over.
int sv[2] = {-1,-1};
if(::socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, sv) != 0)
{
THROW_EXCEPTION(ServerException, SocketPairFailed)
}
std::auto_ptr<IOStream> stream(new SocketStream(sv[0]));
// Fork
pid_t pid = 0;
switch(pid = vfork())
{
case -1: // error
::close(sv[0]);
::close(sv[1]);
THROW_EXCEPTION(ServerException, ServerForkError)
break;
case 0: // child
// Close end of the socket not being used
::close(sv[0]);
// Duplicate the file handles to stdin and stdout
if(sv[1] != 0) ::dup2(sv[1], 0);
if(sv[1] != 1) ::dup2(sv[1], 1);
// Close the now redundant socket
if(sv[1] != 0 && sv[1] != 1)
{
::close(sv[1]);
}
// Execute command!
::execv(args[0], args);
::_exit(127); // report error
break;
default:
// just continue...
break;
}
// Close the file descriptor not being used
::close(sv[1]);
// Return the stream object and PID
rPidOut = pid;
return stream;
#else // WIN32
SECURITY_ATTRIBUTES secAttr;
secAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
secAttr.bInheritHandle = TRUE;
secAttr.lpSecurityDescriptor = NULL;
HANDLE writeInChild, readFromChild;
if(!CreatePipe(&readFromChild, &writeInChild, &secAttr, 0))
{
BOX_ERROR("Failed to CreatePipe for child process: " <<
GetErrorMessage(GetLastError()));
THROW_EXCEPTION(ServerException, SocketPairFailed)
}
SetHandleInformation(readFromChild, HANDLE_FLAG_INHERIT, 0);
PROCESS_INFORMATION procInfo;
STARTUPINFO startupInfo;
ZeroMemory(&procInfo, sizeof(procInfo));
ZeroMemory(&startupInfo, sizeof(startupInfo));
startupInfo.cb = sizeof(startupInfo);
startupInfo.hStdError = writeInChild;
startupInfo.hStdOutput = writeInChild;
startupInfo.hStdInput = INVALID_HANDLE_VALUE;
startupInfo.dwFlags |= STARTF_USESTDHANDLES;
CHAR* commandLineCopy = (CHAR*)malloc(rCommandLine.size() + 1);
strcpy(commandLineCopy, rCommandLine.c_str());
BOOL result = CreateProcess(NULL,
commandLineCopy, // command line
NULL, // process security attributes
NULL, // primary thread security attributes
TRUE, // handles are inherited
0, // creation flags
NULL, // use parent's environment
NULL, // use parent's current directory
&startupInfo, // STARTUPINFO pointer
&procInfo); // receives PROCESS_INFORMATION
free(commandLineCopy);
if(!result)
{
BOX_ERROR("Failed to CreateProcess: '" << rCommandLine <<
"': " << GetErrorMessage(GetLastError()));
CloseHandle(writeInChild);
CloseHandle(readFromChild);
THROW_EXCEPTION(ServerException, ServerForkError)
}
CloseHandle(procInfo.hProcess);
CloseHandle(procInfo.hThread);
CloseHandle(writeInChild);
rPidOut = (int)(procInfo.dwProcessId);
std::auto_ptr<IOStream> stream(new FileStream(readFromChild));
return stream;
#endif // ! WIN32
}
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